JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="right"></div>
    <div class="left"></div>
</div>

CSS

.container {
    width:600px;
    height:200px;
    border:2px solid yellow;
    font-size: 0px;
}

.left {
    width:70%;
    height:200px;
    background:red;
    overflow:hidden;
    display: inline-block;
}
.right {
    height:200px;
    width:30%;
    background:blue;
    display: inline-block;
}